Macmillan English Grammar

3 Choose the correct option, A, B or C, to complete the sentence.

a Alexander Fleming is usually described as the

scientist who discovered penicillin in 1928,

but in fact at least two other scientists had

noticed its antibiotic effect .. 13 he did.

b The antibiotic effects of penicillin had

been recorded in France by a Costa Rican

scientist.

c Fleming conducted experiments with

penicillin, butHHHH decided that it would

not work as an antibiotic in humallS.

d Luckily, other scientists continued with the

research and we re making progress

when the Second World War began in 1939.

e However, at that point they had not.

treated any patients.

a A after B beforeCalready

b A already

B laterCstill
c

A after B laterCjust

d A after

BafterwardsCstill

e A yet

BjustCstill
f

A after B laterCyet

g A just

BstillCyet

h A still

ByetCalready

A yet

B stillCalready

Alater

Byet Calready

f A few years .. HH' in 1942, Bumstead and

Hess became the first doctors in the world to

save a patient using penicillin.

g At this point, Dorothy Hodgkin had ..

described the chemical structure of penicillin,

so it was now possible for penicillin to be

produced in large quantities.

h Penicillin is... used to treat many

infectiollS.

However, ....H in the 1940s, the first cases

of resistance to the drug had been reported.

Because bacteria can change, they grow

resistant to antibiotics, and scientists have not

found a solution to this problem.

G

4 Rewrite each sentence 50 that it contains the word or words in capitals.

a They'll be back after twelve.

.....The-?jIIJ..bee ..bec.K ..{VI,.lh.e- ..e±le-rnQQ~.

b Can you do it now, please?

c When the lesson finished, Helen asked the teacher a question.

d My head hasn't stopped aching.

e Jan wasn't late for his musie lesson.

f !t's eight o'clock and I've be en waiting for two hours.

g The film began, and a few minutes later all the lights came on.

h Lunch isn't ready yet, so before that we'U sit in the garden

IN

AT

AT

STILL

TIME

SINCE

SOON AFTER

THEN